Active noise-control device

Abstract

Disclosed is an active-noise control device including two passive attenuation earphones each provided with an external microphone, an internal microphone and a loudspeaker. The control device includes a first processing chain having a feedforward filter, a feedback filter and a reconstruction module. The control device includes a second processing chain having a sound source identification module, said second processing chain being implemented in parallel with the first processing chain, and being suitable for parameterizing the first processing chain.

Description

BACKGROUND OF THE INVENTION[0001]Numerous people work in noisy environments in which they are exposed to very high levels of noise coming from a variety of sources. Such noisy environments are to be found for example on building sites, on demolition sites (dynamiting), in factories using machine saws, etc. In such noisy environments, it is necessary to reduce noise levels in order to protect the hearing of such people.[0002]Other people work in noisy environments in which noise levels exist in continuous manner that are lower, thereby presenting a smaller risk in the short term of deteriorating hearing capacity, but tending to increase fatigue and stress, and to reduce the capacities of such people for attention and concentration. Such noisy environments are to be found for example in open work spaces as used in call centers. The level of noise needs to be attenuated in order to improve the working conditions of such people.[0003]Other people, in a non-professional setting, also des...

AI Technical Summary

Benefits of technology

The patent is about a control device that can identify the type of external noise and use that information to control the noise in a way that will be effective. By having two processing channels, one with the identification module and one without, the control device can make the noise control more effective.

Problems solved by technology

Numerous people work in noisy environments in which they are exposed to very high levels of noise coming from a variety of sources.

Other people work in noisy environments in which noise levels exist in continuous manner that are lower, thereby presenting a smaller risk in the short term of deteriorating hearing capacity, but tending to increase fatigue and stress, and to reduce the capacities of such people for attention and concentration.

They therefore do not make it possible to attenuate an undesirable noise while amplifying a useful noise in a noisy environment in circumstances where the useful noise and the undesirable noise present equivalent sound levels.

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